The Sun activity increases during every ...
5 years
11 years
22 years
1300 years
Solar cycles have an average duration of about 11 years. The periodic changes in the Sun's activity include changes of the levels of solar radiation and the number and size of sunspots.
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Answers by country
5 years
11 years
22 years
1300 years
answers
France
19
Austria
73
Greece
20
the Netherlands
12
Republic of Ireland
12
Germany
400
Pakistan
24
Canada
21
the United Kingdom
125
Switzerland
34
the United States
233
Australia
43
India
382
Poland
8033
the United Arab Emirates
15
the Philippines
32
Unknown
16